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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Mount Prospect IL
National Weather Service Forecast for:
Mount Prospect IL
Issued by: National Weather Service Chicago, IL |
| Updated: 2:46 pm CDT Jun 30, 2026 |
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This Afternoon
 Hot
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Tonight
 Mostly Clear
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Wednesday
 Hot
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Wednesday Night
 Mostly Clear
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Thursday
 Sunny then Slight Chance T-storms
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Thursday Night
 Chance T-storms
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Friday
 Showers Likely
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Friday Night
 Chance T-storms then Showers Likely
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Independence Day
 Chance T-storms
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| Hi 95 °F |
Lo 78 °F |
Hi 96 °F |
Lo 80 °F |
Hi 96 °F |
Lo 76 °F |
Hi 93 °F |
Lo 73 °F |
Hi 85 °F |
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Extreme Heat Warning
Hazardous Weather Outlook
This Afternoon
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Mostly sunny and hot, with a high near 95. Heat index values as high as 106. Southwest wind around 15 mph, with gusts as high as 30 mph. |
Tonight
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Mostly clear, with a low around 78. Southwest wind 10 to 15 mph, with gusts as high as 30 mph. |
Wednesday
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Sunny and hot, with a high near 96. Heat index values as high as 104. West southwest wind 10 to 15 mph, with gusts as high as 25 mph. |
Wednesday Night
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Mostly clear, with a low around 80. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. |
Thursday
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A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 96. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. |
Thursday Night
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A chance of showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 76. Chance of precipitation is 30%. |
Friday
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A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 93. Chance of precipitation is 60%. |
Friday Night
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A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 73. |
Independence Day
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A chance of showers and thunderstorms. Partly sunny, with a high near 85. |
Saturday Night
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Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 69. |
Sunday
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A chance of showers. Partly sunny, with a high near 83. |
Sunday Night
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Mostly cloudy, with a low around 68. |
Monday
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Mostly sunny, with a high near 84. |
Forecast from NOAA-NWS
for Mount Prospect IL.
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Weather Forecast Discussion
930
FXUS63 KLOT 301908
AFDLOT
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
208 PM CDT Tue Jun 30 2026
.KEY MESSAGES...
- Dangerous heat wave continues into Thursday, with daytimes
highs in the low to mid 90s and peak afternoon heat indices of
100 to 105 degrees (locally higher).
- While not a complete wash out, thunderstorm chances increase
late Thursday, with a couple of waves of showers and
thunderstorms expected Friday into the 4th of July weekend.
Some storms may be severe and produce heavy rainfall.
&&
.DISCUSSION...
Issued at 208 PM CDT Tue Jun 30 2026
The ongoing heat and humidity continues to be the primary weather
story through Thursday.
A persistent upper-level ridge, with H5 heights in excess of
596 DAM, will remain centered across Kentucky and Tennessee
through Wednesday, before gradually expanding eastward towards
the central Atlantic coast for the second half of the week.
Strong capping under this ridge will continue curtail the threat
for showers and thunderstorms locally through at least Thursday
afternoon/evening. Accordingly, unabated diurnal heating of the
very moist low-level airmass will push afternoon high
temperatures in the low to mid 90s (highest in the urban areas
around Chicago) each afternoon through at least Thursday. When
combined with surface dewpoints in the low to mid 70s, heat
indices will again top out in the 100-105 degree range (locally
in excess of 105) both Wednesday and Thursday. Meanwhile, expect
very warm overnight temperatures, with readings likely
struggling to fall out of the low 80s in the city tonight and
again Wednesday night. While such readings are not necessarily
uncommon to experience on a day in the middle of summer in our
area, it is less common to experience such conditions on 4+
straight days with little to no relief. It is thus the
cumulative effects of the heat that is most concerning with this
heat, and not necessarily the peak temperatures and heat
indices on an individual day. Therefore, no changes are planned
to going heat headlines currently in effect.
Wednesday, and much of Thursday, waves of severe thunderstorms
will continue to be favored northwest of our area (from the
Plains northeastward through the Upper Midwest) within a belt of
active west-southwesterly upper-level flow residing along the
west-northwestern periphery of the upper-ridge. However, as the
upper ridge begins to expand eastward, it will allow this active
belt of westerly upper-level flow to shift into our area late
in the week. Accordingly, while our area will get relief from
the extreme heat this weekend, it will come at the price of
increasing chances for showers and thunderstorms. While it will
not be raining and storming constantly, it appears we may end up
with a couple of waves of showers and thunderstorms during the
holiday weekend, most notably late Friday and on Saturday. Some
of these storms could be severe and produce torrential
downpours.
KJB
&&
.AVIATION /18Z TAFS THROUGH 00Z THURSDAY/...
Issued at 1230 PM CDT Tue Jun 30 2026
Forecast concerns include...
Gusty southwest winds this afternoon and again Wednesday.
Possible mvfr level clouds Wednesday morning.
A high mvfr/low vfr bkn/ovc deck has developed across northern
IL late this morning and will continue to slowly lift to vfr
shortly, and is then expected to scatter out through the
mid/late afternoon. Another period of mvfr level clouds is
possible Wednesday morning, similar to the past two mornings.
Confidence is low and for now have opted to include scattered
mention for this possibility.
Southwest winds will remain gusty this afternoon but the highest
gusts appear most likely during the mid/late afternoon and then
speeds/gusts will diminish with sunset though periodic gusts
will remain possible for the Chicago terminals tonight. Gusts
will increase back into the lower/mid 20kt range Wednesday
morning. cms
&&
.CLIMATE...
Issued at 1249 AM CDT Tue Jun 30 2026
.Daily Records for the Upcoming Week........
Chicago (KORD)
Record High Record Warm Minimum
June 30 99 (1953) 80 (2018)
July 1 103 (1956) 78 (1931)
July 2 99 (1970) 79 (1911)
July 3 102 (1949) 78 (1911)
July 4 102 (2012) 80 (1921)
Rockford (KRFD)
Record High Record Warm Minimum
June 30 102 (1931) 76 (2018)
July 1 101 (1931) 76 (1970)
July 2 99 (1910) 74 (1970)
July 3 99 (1925) 75 (2012)
July 4 102 (2012) 77 (1977)
NWS Chicago
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Extreme Heat Warning until midnight CDT Thursday night for
ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-ILZ012-
ILZ013-ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-
ILZ103-ILZ104-ILZ105-ILZ106-ILZ107-ILZ108.
IN...Extreme Heat Warning until midnight CDT /1 AM EDT/ Thursday
night for INZ001-INZ002-INZ010-INZ011-INZ019.
LM...Small Craft Advisory until 9 PM CDT this evening for Winthrop
Harbor IL to Gary IN.
&&
$$
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